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Battery energy storage system with short circuit protection, and method

a battery energy storage and short circuit protection technology, applied in the field of battery energy storage, to achieve the effect of improving the means of short circuit protection of battery units

Active Publication Date: 2014-02-18
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention aims to provide better protection against short circuits in energy storage systems. It achieves this by using a system where each battery module is connected in series with its own semiconductor switch, which disconnects the malfunctioning battery module to protect other battery cells from harmful current levels. This also prevents damage to the battery modules from voltage source converters or transmission systems that might be connected to the energy storage.

Problems solved by technology

A drawback with these short circuit protection switches is that they have to be dimensioned for high voltage, including large space requirements, and must be able to break very large short circuit currents.

Method used

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  • Battery energy storage system with short circuit protection, and method
  • Battery energy storage system with short circuit protection, and method
  • Battery energy storage system with short circuit protection, and method

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Embodiment Construction

[0028]The same reference numerals are used throughout the description for denoting same or similar parts.

[0029]FIG. 1 illustrates an apparatus for providing power to an AC power transmission system. It includes a capacitor 1 in parallel with a high voltage DC power source 2-4, 6, 7 connected to the DC side of a voltage source converter 5. The voltage source converter 5 is connected on its other side to an AC high voltage power transmission system (not illustrated). The DC power source comprises an energy storage system having a plurality of parallel strings 4a-c, and each string comprises battery stacks 3a-c connected in series. Each string 4a-c is connected to the voltage source converter 5 by common bus bars via a first and second disconnector 6a-f, so that the whole energy storage string can be selectively connected and disconnected from the common DC buses and the voltage source converter 5. Each battery stack 3a-c comprises a stack of battery units 2a-c in series and a stack co...

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PUM

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Abstract

A battery energy storage system including a control unit and a plurality of battery units. The battery units are arranged in series, and each battery unit includes a semiconductor switch and a battery module including a plurality of battery cells. Each battery module is connected in series with a respective semiconductor switch, and the control unit is operatively connected to the semiconductor switch and adapted to control the semiconductor switch of every battery unit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of pending International patent application PCT / EP2009 / 067764 filed on Dec. 22, 2009 which designates the United States and the content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates generally to the field of electric power transmission systems, and in particular to battery storages for use in such power systems. By electric power transmission systems is meant a distribution system of at least 3 kV, preferably at least 10 kV.BACKGROUND OF THE INVENTION[0003]Electric power systems need to provide electric power in a reliable fashion. Therefore such systems often comprise backup devices, for example in form of DC power sources. The backup devices may provide power for evening out fluctuations, shortages etc.[0004]An example of such a device, usable as a backup, is a battery energy storage as illustrated in FIG. 3. The battery energy storage 10 comprise...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02H3/20
CPCH02J7/0031H02J7/0026Y10T307/685H02J7/0014H01M10/00H01M10/42H02H7/18
Inventor TINGLOW, FREDRIKSVENSSON, JANBACKMAN, MAGNUSHERMANSSON, WILLYHOSINI, FALAH
Owner HITACHI ENERGY LTD